Planoorapm co



W. JOHN.

FURNACE FOR ANNEALING METALy PLATES.

APPucAnoN FILED APR.1-5, 1919.

1,310,911, A I Y Patented July 22, 1919.-

2 SHEETS-SHEET l.

THE COLUMBIA PLANOGRAPH co.. WASHINGTON. vD. c.

W. JOHN.

FURNACE FOR ANNEALING METAL PLATES.

APPLICATION FILED APR. I5, I9I9.-

Patented July 22, 1919.

2 SHEETS-SHEET 2.

TME COLUMBIA PLANouRAPH co.. WASHINUTON. D.. c.

. jectl of theKing of WILLIAM JOI-IN, OF MORRISTON, SWAN SEA, WALES.

FURNACE ron ANNEALING METAL PLATES.

To all 'whom t may concern: s s.

y' Be it known that I, WILLIAM JOHN, a sub- Great Britain, residing at Morriston, in the -borough of Swansea, South Wales, have invented certain new and useful Improvements in and Relating `to' Furnaces for Annealing Metal Plates, of which the following is a specification.`

This invention relates to thek construction of furnaces ofthe kind which are used `for annealing metal, more especiallyrolled iron plates preparatoryto being tinned or plated.

A. furnace of this kind, as hitherto lconstructed, usually has a lire-place or replaces at one end, reinforced Vin some cases with fire places in the sides, and a doorway for admitting and withdrawing the plates y at one end, the smoke and heat from the lire passing through the furnace into the flues and up through the stack or chimney to the open air. The plates to be treated are covered with an iron casing and run into the furnaces on atrolley.` They are subjected to the heat for about 8 or 9 hours to complete the` annealing process, and are then withdrawn. During this process, a large percentage' of the` heat passes with halfburnt gases inelfectivelyl around the plates and is wasted. l

The main object., of my invention is to conserve the heat, reinforce itY where required, and apply it in the` most effective way to secure the desired results.

With these objects in view, I propose to build the furnace on a substantially tapered plan, the door-way for admission of the trolleys being at the smaller end, another for their discharge at the larger end, and fireplaces, one oneach side of the discharging door, the purpose being to distribute,

the heat evenly on both sides and to concentrate the heated streams of air and gas and prevent their being unduly dissipated and cooled before reaching the smaller end. For the same purpose and to increase the heat and combustion where most wanted, I propose to provide additional fire places and other improvements.

These will be best. described with reference to the accompanying drawings, showing a furnace constructed in accordance withv my invention. y

In these, Figure l is a central longitudinal section of the furnace, Fig.2a plan of the same in two sections, the upper half on Specification of Letters Patent.

Patented July 22, 1919.

Application led April 415. 1919. Serial No. 2903298.

line 2x and the lower half on line 2y of Fig. l', the tracks E being omitted.

Fig. 3'is a section on line 3X of Fig. 2.

Fig. 4: is a section on line 4ax of Fig. 2.

Fig. 5 is a section on line 5x of Fig. 2.

All views of the drawings, excepting Fig. l, omit the stands, trucks or trolleys F.

yIn the front wall at the end of the furnace, where the tapering side walls A are at their greatest distance apart, I provide the twofireplaces C C for coal, with stokeholes C3 one on each side of a central opening for discharge of the trolleys. l

About midway of the length of the furnace in the side walls I provide two additional lire places D D for burning coke with stokeholes D3. These are so placedthat the heated gases and smoke from the coal `fireplaces C, after passing over the bridges C1, are made to they become ignited and, passing over the bridges D, intensify the heat in the first portion R of the furnace through which they pass on their way to the Hues S through lwhich they pass to4 discharge iue T. The

walls at the sides of the parts D2 of the casings of the coke fireplaces are extended upward to the roof M as partitions across the furnace, openings bridges C1 and the pass over the coke fires wherecovered by drop doors K and L being 1eft85 `insure that the streams of heated gases shall pass along the sides ofthe furnace andover the coke fires before reaching the flues at the narrow end.

The flues S communicate with flue T which discharges into the stack U on the raising of a damper W, and also communicate with culverts Y at points S under the floor which pass below the coke and coal lire places and discharge into the spaces above the fires in the latter. Fans X, rotatable from the outside are mounted in the culverts Y for the purpose of drawing the hot gases and smoke through the iues S and flue T and driving them back to the coal lires to mingle with the new gases and undergo more complete combustion.

Right through ithe lengthof the furnace a central runway or ltrack E is provided along.

which the iron trolleys or trucks F on which the plates are stacked can run. These trolleys or trucks travel on ball bearings situated in parallel grooves in the runway in a known manner, the bottom of each trolley or truck beingl correspondingly grooved.

The charge stands F, see Fig; l, are-inserted successively at the door B and impelled toward the discharge end Where they are removed through the door J, a fresh one being'inserted as a used one is reino-ved, the latter being then unloaded and `'brought aroundV torrepeat the journey witha Vfresh load# Each load of plates is thus subjected to a gradually increasing` heat to a maximum 'degree `near the `coke fires in the first chamber R, where the waste gases become incandescent, and is passed `on to the annealing chamber N, thence to the soaking chamber Pbeyond the furnace ires, and lis finally discharged. A small chimney Z is provided in the roof of the chamber P. Each stand or truck or trolley F may conveniently carry four stacks of plates (not shown) and the whole runway may accommodate about four stands within the furnace. 4Of these, two may occupy lthe space Rbetween the admission door B and the coke lire places D, one may occupy the chamber N and one may occupy the chamber P, ,and beyond the furnace fires at the endof P is `the door J for the discharge of the trolleys. V t

` The stackU will be used only wheny the fires are 4set going. lVhen the furnace attains itsproper-heat the damper Wwill be 4fclosed, -andfthe heated gases and smoke will ""'be driven along the culverts-Y as described to pass againover the coal fire-places C. Steam'lblowers may also be fixed under the iirelplaces to drive-thev heated air, etc., toward thenarrowend `of the furnace and assist the fan X in insuring a continuous circulating current as indicated by arrows in Fig. 3; When the furnace becomes overfull of heated air and gases, "these Awil-LbeVv forced back .to the soaking compartment P and be discharged throfuxgh a small chimney Z. The condition of the pots may be watched throughsight holes V.

It will be understood that I do not limit my invention t0 the precise numbers of stands, pots, chambers or fire-places or proportions mentioned or sho-wn inv this description.

l. A furnace, for annealing` metal platea a central track along the same for trolleys', a drop door at the receiving end and a Ysimilar do-or at vthe discharge end, the sidewalls of the furnace being tapered so thatit is wider at the'discharge end than at thereceiving` end, two fireplaces for coal at the wider end, one ateachsideof rthe discharge door, and two additional fireplaces for coke,

one in eachfof thetaper side walls near the middlecf th'ey furnace.

2. A furnace for annealing metal plates, a central track along the sarrre V for trolleys, a drop door at'the receiving end and a similar door at the discharge end, the side walls of the furnace being taperedso that-it is wider at the discharge 'endthan at the receiving en-d, `two fireplaces forcoal at the wider end, `one at each side of the discharge door, `two additional fireplaces for"`coke,"-`one in `each of thetaper side walls near the middle of the furnace, and two `transverse partitions dividing the furnace into three chambers, drop doors in such partitions, also acu'lvert or culverts forlreturningthe gases for re-co-nsumption,together withfmeans for propelling` and meanslfor --ifegulating "the flow` of said gases.

In testimony whereof, VIi'hjavefsigned my l i name vto thisl specification the; presence` vof two subscribing witnesses.

Wtne'sses'z' -Iv'on JOHN, i KATH'LN Poom.

'fwinniAMl JOHN-Q "i y y 'Genies of'thispteiit may be obtained for ,ve cents e'a'ch,byuraddi'ssingftlie 'Commissner cffIPatents"7 i f f-wasningtoanc. v 1 i 

